The suprachiasmaticus nucleus clock may not be necessary to align circadian rhythms with the light-dark cycle

Circadian clocks regulate functions ranging from alertness and reaction time to body temperature and blood pressure. A new study challenges and disproves the commonly held notion that light resets the master clock, which then coordinates the other, subordinate clocks. Several metabolic and psychiatric diseases are associated with circadian rhythm and sleep disturbances, and this research opens the doors toward an improved understanding of these disorders.

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